An expert in the field of surf craze mentioned an incident in which two were shot at as "really extreme".
Waikato police investigate after two people were shot at while surfing at Te Maika peak last Thursday – bullets that are only 2 meters away.
The police said someone had made an exception to "strangers" with "their" water.
The shots came from the surrounding bushland, which was widely used for hunting, police said.
Jhan Galava promotes on surf anger.
"It is the first time I have heard that someone is actually shot," he told RNZ & # 39; s Jesse Mulligan.
"That is really extreme.
"In all the research that I have done and places where I have surfed, there has never been such a thing.
"There are urban legends in Hawaii, stories about guns that are used but have never been fired."
There were a number of causes of surf anger, including but not limited to, intergenerational learned violence, low coping skills, notions of local rights and competition.
"One of the themes is protection, they want to protect their surfing holiday, they see it as a scarce commodity.
"Local surfers are really passionate and have a strong connection with where they surf and they feel they have the rights and rights at that place.
"They want the best waves if they have done the time there."
General reactions to outsiders were to abuse, crush or ram them with their boards.
"There are many ways in which they do that."
His research showed that the surfers had little desire to change the tactics of intimidation to protect their surf spots.
"They are very happy with their way to solve it, if you've really intimidated someone and they're not coming back, that's a positive outcome for them."
He said it was "a very small percentage of surfers" who participated in bullying tactics and that scenes around the world were "pretty much the same".
"[But] locals set their own protocols, their own etiquette. "
Mr Galava, a sports psychologist, has taken a break from his research into surf anger to work with a number of sports organizations, including surfers from The Blues and New Zealand, who hope to be able to compete at the next Olympics.